Digital Signal Processing Apparatus, Digital Signal Processing Method, Digital Signal Processing Program, Digital Signal Reproduction Apparatus and Digital Signal Reproduction Method

Abstract

A digital signal processing apparatus includes: a detection section; a prediction section; and a decision section. The detection section is configured to detect a signal position at which a signal component may possibly have been removed from a digital signal in a signal conversion processed state upon the signal conversion process. The prediction section is configured to predict, based on data at correlating portions of the digital signal in the signal conversion processed state in a demodulation frequency band, data at the signal position prior to the removal detected by the detection section. The decision section is configured to decide whether or not the absolute value of the data at the signal position prior to the removal predicted by the prediction section is lower than a resolution at the signal position and adopt the predicted data prior to the removal as interpolation data.

Description

CROSS REFERENCES TO RELATED APPLICATIONS [0001] The present invention contains subject matter related to Japanese Patent Application JP 2006-174980 filed with the Japan Patent Office on Jun. 26, 2006, the entire contents of which being incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] This invention relates to an apparatus, a method and a program for processing, and an apparatus and a method for reproducing, a digital signal obtained by a signal conversion process such as a digital audio signal in a form compression-coded using an irreversible compression method such as, for example, frequency correlation coding. [0004] 2. Description of the Related Art [0005] A compression process of an audio signal is implemented by a combination of “quantization (PCM (Pulse Code Modulation) signal)”, “time correlation coding” which uses time continuity of the audio signal, “frequency correlation coding” which uses the auditory sense of the human...

AI Technical Summary

Benefits of technology

[0022] Consequently, a reconstruction process of a digital signal formed by a signal conversion process can be performed by predicting a digital signal component which may possibly have been removed upon the signal conversion process and adopting the digital signal component as interpolation data only if the digital signal component has been predictively removed with a high degree of possibility. Accordingly, even if the digital signal in the signal conversion processed state includes a signal component which has been removed upon the signal conversion process, the influence of the removed signal component, can be suppressed to the minimum. Consequently, a digital signal of improved qualify can be reconstructed.

[0036] Further, with the digital signal processing apparatus, a digital signal obtained by a compression coding process can be processed without the necessity to separately store and retain a signal component of a compression coded digital audio signal which has been removed or cut upon the compression coding process from within the digital audio signal in the compression coded state. Consequently, the digital signal processing apparatus is high in multiplicity of use.

Problems solved by technology

However, the techniques disclosed in Patent Documents 1 and 2 are not satisfactory in the following point.

This gives rise to such a restriction that the encoding process and the decoding process should be performed in the same apparatus.

Therefore, it is considered that the technique is not suitable for universal use.

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